Here's a link to a useful listing of all the Ambroid 1 of 5000 kits:
I lusted after them and bought each as they were released. Built all of the first series but gave up buying them after #4 of the second series as it seemed they were really reaching for prototypes. Plus I was deeply into Colorado narrow gauge by then and ended up selling all my '50s era standard gauge models and kits except for my first locomotive, a Mantua Shifter 0-4-0. Still have it. Also still have a small drawer full of Mantua and Comet paper freight car sides. Mostly reefers.
Like many modelers of the time I was greatly influenced by John Allen's articles and Varney ads. Hard to believe he's been gone for over 46 years. I know in some circles his work is no longer greeted with acclaim because he wasn't a prototype modeler and, like Malcolm Furlow's modeling, it seems to lean heavily towards caricature. But the G&D seemed credible and real to me at the time.....